import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text("dataa"),
        ),
        body:HomePage()
      ),
    );
  }
}

class HomePage extends StatefulWidget{
  HomePage({Key key}):super(key:key);
  // int count = 1;
  _HomePageState createState()=>_HomePageState();
}
class _HomePageState extends State<HomePage>{
  int count = 1;
  @override
  Widget build(BuildContext context){
    return Center(child: Column(
          children: <Widget>[
            Text("${this.count}"),
            SizedBox(
              height: 200,
            ),
            RaisedButton(
              child: Text("按钮"),
              onPressed: (){
                // this.count++;
                // setStata()
                setState(() {
                 this.count++; 
                });
                print(this.count);
              },
            )
          ],
        ),);
  }
}